Clock



June 3, 1924. 1,496,348

R. c. MCARTHUR CLOCK Filed Dec. 14, 1922 3 Sheets-Sheet 1 E. l J

x Z6 Z9 Z0 WITNESS INVENTOI? ROBERT C. M An'r-m/n Mam/z A TTORNE Y8 June 3 r" R. C. M ARTHUR CLOCK 3 Sheets-Sheet '2 Filed Dec. 14 1922 I A TTOBWE V8 June 3, 1924.

R. C. M ARTHUR CLOCK 1922 3 Sheets-Sh et 5 ROBERT 1; A MLQQ Filed Dec. 14

0 8 L m W ATTORNEYS Patented June 3, 1924.

UNITED STATES ROBERT C. McARTI-IUR, O'F SALAMANCA, NEW YORK. I

cLocx.

Application filed December 14, 1922. Serial No. 606,946.

To all whom it may concern:

Be it known that I, ROBERT C. MCARTHUR, a citizen of the United States, and a resident of Salamanca, in the county of Cattaraugus and State of New York, have invented certain new and useful Improvements in Clocks, of which the following is a specification.

This invention relates to an improvement iii-clocks, and the object of the invention is to provide a clock which affords a clear and distinct indication of local standard time and daylight-saving time in such manner as to be unmistakeable to any person of ordinary intelligence.

Another object of the invention is to provide a clock of this character which also indicates time at various places in the country or on the earth and in which the clearness and distinctiveness of the indication is greatly enhanced.

Another object is to provide a clock of this character which is of simple and durable construction, attractive in appearance, reli able in operation and easy and comparatively inexpensive to manufacture.

Other objects and advantages of the invention reside in certain novel features of the construction, combination and arrangement of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming part of this specification, and in which:

Figure 1 is a view in front elevation, showing the preferred embodiment of the invention; I

Figure 2 is a similar view with the front plate removed;

Figure 3 is a view similar to F igures'l and 2 but showing the minute dial and the adjustable dial removed; A

Figure 1 is a view in central longitudinal vertical section, parts being shown in elevation for the sake of illustration;

Figure 5 is a group view in perspective, showing the dials and associated parts prior to assembly;

Figure 6 is a fragmentary View in side elevation, showing the releasable lock mecha nism for the hour dials; and

Figure 7 is a fragmentary perspective view of the mechanism shown in Figure 6. Referring to the drawings wherein for the sake of illustration is shown the preferred embodiment of the invention the numeral 10 designates a frame which is mounted within a suitable casing 11. The frame 10 is provided with suitable bearings for rotatably mounting a solid shaft 12 and a hollow or sleeve shaft 13 fitted on the solid shaft 12.

A minute dial 15 is keyed or fixed to the outer end of the shaft 12. The outer peripheral portion of the dial 15 is marked and numbered to indicate the minutes and the central portion thereof is dished or offset inwardly, as at 15 to provide a'space to accommodate nuts or the like should the same be threaded on the end'of the shaft 12 to prevent endwise displacement of the dial 15.

Two hour dials, designated generally at 16 and 17 are provided, the dial 16 being fiXBCl'tO the hollow or sleeve shaft 13 by means of arms 18 and the dial 17 being releasably clamped on the face of the dial 16 by means of resilient clam ing lugs 19. The dial 16 bears a series 0 numbers 20 ranging from 1 to 12 and disposed in circu-' lar series around the outer or front face of the dial. The numbers 20 serve to indicate eastern, central, mountain and acific time as will presently appear. The dial 17 is like the dial 16 in the form of a flat annular plate and it is arranged to lie flush against the face of the dial 16. This dial 17 bears. a circular series of numbers 21 ranging from 1 to 12 and serving to indicate both standard and daylight saving time as will be presently understood; and the dial 17 is also provided with a circular series of openings 22 adapted to be brought into registration with the numbers 20 of the dial 16 so that the dial 17 does not obstruct the view of the numbers 20, these numbers be ing viewable through the openings 22. As shown in Figure 2 the openings 22 and the 7 numbers 21 are staggered and preferably the numbers are larger than the openings. In the preferred arrangement the curvature of the arms18 and of the dished portion 15 of the dial 15 is such that the outer faces of the dial 15 and the dial 17 lie in the same vertical plane.

The casing 11 which encloses the operative parts of the invention includes a front plate 25 disposed immediately in front of the dials 15 and 17 (see Fig. 4). This front plate is provided with openings 26 and 27 arranged respectively above and below the center of the blade and to one side thereof and'otherwise so located that the numbers of the series'21 of the dial 17 are successfully is viewable through the opening 26 repre sents standard local time and the number viewable through the opening 27 represents the daylight saving time whereas the numbers viewable through the openings 28,29,

. 30 and 31 represent easternfcentral, mountain and pacific time. On theopposite side of the center of the front plate from the openings 26 and 27 this plate is provided with an arcuate slot or opening 32 through.

which the numbers and markings of the minute dial 15 may be viewed. Preferably :the face of the front plate -25. has applied thereon arrows 34, 35 and 36 which extend to the openings 36, 37 and 32 respectively to correlate and organize the impression with which these openings and the numbers visible through these openings effect upon the eye and mind of the observer. It is also to be understood that if desired suitable indicia may be employed adjacent and in conjunction with the openings 26, 27, 28, 29, 30 and 31 to, clearly indicate the time represented through said openings, for instance around the openings 26 and 27 may be placed the indicia', Standard and Daylight Saving and around the openings 28,

. 29, 30 and 31 may be placed the indicia,

Eastern, Central, Mountain and Pacific, respectively, as shown in the drawings.

Any suitable and conventional or standstationary for. substantially the entire hour and is shifted on the hour to enhance the distinctiveness and clearness of the indi a blade spring 50 having one end secured thereto and its other end engaged between pins 51, the tendency of the spring being to normally maintain or urge the roller 47 of the pawl into a seat or recess 46 of the wheel 45. When the roller 47 is received in one of the seats 46 of the wheel 45, the wheel 45 is held against rotation and consequently the sleeve shaft 13 and the dials 16 and 17 are held against rotation notwithstanding the tendency of the motor 41 and the mechanism connecting this motor with the sleeve shaft 13 to rotate the same. Means is provided for momentarily releasingthe roller 47 of the pawl 48 from its engagement with the seat of the wheel 45 so as to permit the motor 41 to actuate the shaft 13 at the proper time. This means may comprise a disk 52 fixed to the solid shaft 12 so as to partake of the rotation thereof. An arm 53 is pivotally mounted, as at 54, upon the disk 52 and normally projects outwardly from the periphery of the disk under the influence of a spring 55 having one end secured to the arm 53 and having its opposite endengaged be tween pins 56. The arrangement is such that for each revolution of the disk 52 the arm 53 will engage the pawl 48 lifting the same sufficiently to disengage the roller of the pawl from one seat of the wheel 45 and at the same time to allow it to come into engagement with the next adjacent seat. For this purpose the walls defining the seats are curved as they merge into the periphery ard means may be utilized for driving the of the wheel, as at 46', and this formation solid shaft 12 and the sleeve shaft 13 since the present invention is not so much concerned with the means for measuring the time as it is for the means for indicatingor exhibiting the same in a manner distinctive and susceptible of being readily understood by a'person of ordinary intelligence. Preferable however a separate springmotor and clockworkis employed for driving each of the shafts 12 and 13, the motor for driving the shaft 12 being indicated at 40 and the motor for driving the shaft 13 being indicated at 41. The details'of the train of gearing and other clockworkbetween the motors and the gears 42 and 43 fixed to the shafts 12 and 13 respectively are not shown in detail but will be readily understood by any one skilled in the art; The shaft 12 which drives the minute dial 15 is continuously driven after the manner of a minute hand of an ordinary clock but preferably the hour dial is held of the walls of the seats together with the arrangement and size of the arm and its spring mounting insure release of the pawl for an interval and to a degree sufficient to allow the motor 41 to rotate the shaft 13 to such an extent as to turn the dials 16 and 17 an angular distance equal to the space between the numerals thereon indicating the hours. In this mannerthe dials 16 and 17 are quickly shifted each-hour and on the hourin accordance with the progress of time. In conjunction with the arm 53 and spring 55 there is preferably provided an approved form of stop such for instance a stop pin which projects laterally from the disk 55 and is arranged to engage the arm 53 so as to properly limit the movement thereof thereby insuring a sufiicient and requisite actuation of the pawl 48.

Since the minute dial 15 is continuously driven after the manner of the minute hand of the. ordinary clock a complete indication of the time is given at all times, the hours being displayed through the openings 26 to 31 and the minutes past the hour being displayed through the slot 32.

With the present invention there is thus exhibited a clear and unmistakable indication of standard, local time and daylightsaving time and at the same time there is displayed an equally clear and unmistakable indication of the time at various places on the earth and in the embodiment shown the time in various zones into which the United States is divided. The clock is adapted for use in any of the zones since it may be readily adapted for any zone by making the proper adjustment of the movable dial 1? .on the dial 16 and then clamping the dial 17 by the lugs or other clamping means shown for the sake of illustration, as at 19, in Figure 2. While I have herein shown and described the preferred embodiment of the invention it is obvious that various changes in the size, arrangement and construction of the parts may be made without departing from the snirit of the invention and the scope of the subjoined claims.

I claim: t

1. In a clock, a casing, a dial arranged within the casing and having numerals thereon indicating hours, said casing having a pair of openings therein through which adjacent numbers of the dial are viewable for simultaneously indicating standard and daylight saving time. 4,

2. In a clock, a casing, an annular dial arranged within the casing and having numerals thereon indicating hours, a cir-,

cular dial arranged within the opening of the annular dial and having numerals and markings thereon indicating minutes, said casing having a front wall provided with an opening through which the numerals of the hour dial are successively viewable and having an arcuate slot through which the markings and numerals of the minute dial are viewable.

3. In a clock, acasing, an annular dial arranged within the casing and having numerals thereon adapted to represent the time at various places on the earth, a second annular dial superposed on said first dial and having numerals thereon adapted to represent standard and daylight saving time, said second dial havingaseries of openings registering with the numbers of the first dial, means for holding the second dial in position on the first dial, a circular dial arranged within the opening of the second annular dial and having numerals and markings thereon indicating minutes, said casing having a front wall provided with a pair of openings through which ad]acent numerals of the, seconddial are Viewable for simultaneously indicating standard and daylight saving time, said front wall also having a series of openings through which the numerals of the second dial are viewable, and having an arcuate opening through which the minute dial is viewable.

4. In a clock, a casing, tw hour dials arranged within the casing, said hour dials being superposed one on the other and having numerals thereon, the numerals of one dial being adapted to represent the time at various places on the earth, the numerals on the other dial being adapted to represent standard and daylight saving time, the front dial having openings registering with the numbers of the back dial whereby said numbers'may be viewed, a minute dial als arranged within the casing and associated with the hour dials, said casing havin a pair of openings through which the adjacent numerals on the hour dial which represent standard and daylight saving time may be viewed, the casingalso having a series of openings through which the numerals on the dial which indicate the time at various places on the earth may be viewed and the casing further having an opening through whichthe minute dial may be viewed.

5. In a-clock, a casing, two hour dials arranged within the casing, said hour dials being superposed one on the other and having numerals thereon, the numerals of one dial being adapted to represent the time at various places on the earth, the numerals on the other dial being adapted to represent standard and daylight saving time, the front dial having openings registering with the numbers of the back dial whereby said numbers may be viewed, a minute dial also arranged within the casing and associated with the hour dials, said casing having a pair of openings through which the adjacent numerals on the hour dial which represent standard and daylight saving time may be viewed, the casing also having a series of openings through which the numerals on the dial which indicate the time at various places on theearth may be viewed and the casing further having an opening through which the minute dial may be viewed, said casing having arrows applied to its opposed face and extendin to the openings through which the standar and daylight saving time are displayed and through the openings through which the minute dial is displayed.

6. In a clock, a casing, two hour dials arranged within the casing, said hour dials being superposed one on the other and having numerals thereon, the numerals of one dial being adapted to represent the time at various places on the earth, the numerals on the other dial being adapted to represent standard and daylight saving time, the front "dial having openings registering with the numbers of the back dial whereby said numbers may be viewed, means for holding the front dial in adjusted position onthe back dial, a minute dial also arranged within the casing and associated with the hour dials, said casing having a pair of openings through which the adjacent numerals on the hour dial which represent standard and daylight saving time maybe viewed, the

casing also having a series of openings through which the numerals on the dial which indicate the time at various places on the earth may be-viewed and the casing further having an opening through which the minute dial maybe viewed.

7. In a clock, a casing, hour dials arranged within the casing, .a minute dial arranged with the hour dial, a shaft connected with; the minute dial, a sleeve shaft mounted. on

the first named shaft and connected with the -hour dial, a .motor for driving the first named shaft, an independent motor for driving the sleeve shaft, and releasable means for holding the sleeve shaft against movement except at predetermined times and comprising a wheel fixed to the sleeve and having aplurality of seats in its periphery, a spring pressed pawl successively engageable with said seats, and means for periodically releasing said pawl from its engagement with oneof said seats while permitting disengagement with the next adjacent seat and'including a disk fixed to the first named shaft and having an arm engageable with the pawl once for each revolution of said disk.

9. In a clock a casing, an hour dial arranged withinthecasing, a minute dial also arranged within the casing and associated with the hour dial, a shaft connected with the minute dial, a sleeve shaft mounted on the first named shaft andponnected with the hour dial, a motor for driving the first named shaft, an independent motor for driving the sleeve shaft, and releasable means for holding the sleeve shaft against movement except at predetermined times.

ROBERT C. Monk THUR. 

